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0bec96d6 AE |
1 | #! /usr/bin/env python3 |
2 | ||
3 | """********************************************************************* | |
4 | * Edward is free software: you can redistribute it and/or modify * | |
5 | * it under the terms of the GNU Affero Public License as published by * | |
6 | * the Free Software Foundation, either version 3 of the License, or * | |
7 | * (at your option) any later version. * | |
8 | * * | |
9 | * Edward is distributed in the hope that it will be useful, * | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
12 | * GNU Affero Public License for more details. * | |
13 | * * | |
14 | * You should have received a copy of the GNU Affero Public License * | |
15 | * along with Edward. If not, see <http://www.gnu.org/licenses/>. * | |
16 | * * | |
17 | * Copyright (C) 2014-2015 Andrew Engelbrecht (AGPLv3+) * | |
18 | * Copyright (C) 2014 Josh Drake (AGPLv3+) * | |
19 | * Copyright (C) 2014 Lisa Marie Maginnis (AGPLv3+) * | |
20 | * * | |
21 | * Special thanks to Josh Drake for writing the original edward bot! :) * | |
22 | * * | |
23 | ************************************************************************ | |
24 | ||
25 | Code used from: | |
26 | ||
27 | * http://agpl.fsf.org/emailselfdefense.fsf.org/edward/CURRENT/edward.tar.gz | |
28 | ||
29 | """ | |
30 | ||
31 | import sys | |
32 | import email.parser | |
33 | import gpgme | |
34 | import re | |
35 | import io | |
36 | import time | |
37 | ||
c96f3837 | 38 | |
0bec96d6 AE |
39 | def main (): |
40 | ||
20f6e7c5 | 41 | handle_args() |
0bec96d6 | 42 | |
c96f3837 | 43 | email_text = sys.stdin.read() |
c96f3837 | 44 | |
65ed3800 AE |
45 | email_from, email_subject = email_from_subject(email_text) |
46 | ||
1da9b527 AE |
47 | plaintext, keys = email_decode_flatten (email_text) |
48 | encrypt_to_key = choose_reply_encryption_key(keys) | |
fafa21c3 | 49 | |
1da9b527 | 50 | reply_message = generate_reply(plaintext, email_from, \ |
897cbaf6 AE |
51 | email_subject, encrypt_to_key, |
52 | "DAB4F989E2788B8DF058E0EFEF1EC52039B36E58") | |
c96f3837 | 53 | |
1da9b527 | 54 | print(reply_message) |
c96f3837 | 55 | |
0bec96d6 | 56 | |
7b06b980 | 57 | def email_decode_flatten (email_text): |
0bec96d6 | 58 | |
86663388 | 59 | body = "" |
394a1476 AE |
60 | keys = [] |
61 | ||
62 | email_struct = email.parser.Parser().parsestr(email_text) | |
63 | ||
64 | for subpart in email_struct.walk(): | |
8bb4b0d5 | 65 | |
394a1476 AE |
66 | payload, description, filename, content_type \ |
67 | = get_email_subpart_info(subpart) | |
0bec96d6 | 68 | |
394a1476 | 69 | if payload == "": |
8bb4b0d5 | 70 | continue |
0bec96d6 | 71 | |
394a1476 | 72 | if content_type == "multipart": |
d437f8b2 | 73 | continue |
0bec96d6 | 74 | |
394a1476 AE |
75 | if content_type == "application/pgp-encrypted": |
76 | if description == "PGP/MIME version identification": | |
8bb4b0d5 | 77 | if payload.strip() != "Version: 1": |
394a1476 AE |
78 | print(progname + ": Warning: unknown " \ |
79 | + description + ": " \ | |
20f6e7c5 | 80 | + payload.strip(), file=sys.stderr) |
8bb4b0d5 AE |
81 | continue |
82 | ||
d437f8b2 | 83 | |
394a1476 AE |
84 | if (filename == "encrypted.asc") or (content_type == "pgp/mime"): |
85 | plaintext, more_keys = decrypt_text(payload) | |
0bec96d6 | 86 | |
394a1476 AE |
87 | body += plaintext |
88 | keys += more_keys | |
89 | ||
90 | elif content_type == "text/plain": | |
86663388 | 91 | body += payload + "\n" |
0bec96d6 | 92 | |
8bb4b0d5 | 93 | else: |
86663388 AE |
94 | body += payload + "\n" |
95 | ||
394a1476 | 96 | return body, keys |
86663388 | 97 | |
c96f3837 | 98 | |
65ed3800 | 99 | def email_from_subject (email_text): |
d437f8b2 | 100 | |
394a1476 | 101 | email_struct = email.parser.Parser().parsestr(email_text) |
d437f8b2 | 102 | |
394a1476 AE |
103 | email_from = email_struct['From'] |
104 | email_subject = email_struct['Subject'] | |
d437f8b2 | 105 | |
394a1476 | 106 | return email_from, email_subject |
d437f8b2 | 107 | |
d437f8b2 | 108 | |
394a1476 | 109 | def get_email_subpart_info (part): |
d437f8b2 | 110 | |
394a1476 AE |
111 | charset = part.get_content_charset() |
112 | payload_bytes = part.get_payload(decode=True) | |
d437f8b2 | 113 | |
394a1476 AE |
114 | filename = part.get_filename() |
115 | content_type = part.get_content_type() | |
116 | description_list = part.get_params(header='content-description') | |
d437f8b2 | 117 | |
394a1476 AE |
118 | if charset == None: |
119 | charset = 'utf-8' | |
0bec96d6 | 120 | |
394a1476 AE |
121 | if payload_bytes != None: |
122 | payload = payload_bytes.decode(charset) | |
123 | else: | |
124 | payload = "" | |
0bec96d6 | 125 | |
394a1476 AE |
126 | if description_list != None: |
127 | description = description_list[0][0] | |
128 | else: | |
129 | description = "" | |
0bec96d6 | 130 | |
394a1476 | 131 | return payload, description, filename, content_type |
0bec96d6 | 132 | |
0bec96d6 | 133 | |
394a1476 | 134 | def decrypt_text (gpg_text): |
86663388 | 135 | |
394a1476 AE |
136 | body = "" |
137 | keys = [] | |
0bec96d6 | 138 | |
394a1476 | 139 | gpg_chunks = split_message(gpg_text) |
86663388 | 140 | |
394a1476 | 141 | plaintext_and_sigs_chunks = decrypt_chunks(gpg_chunks) |
0bec96d6 | 142 | |
394a1476 AE |
143 | for chunk in plaintext_and_sigs_chunks: |
144 | plaintext = chunk[0] | |
145 | sigs = chunk[1] | |
9eb78301 | 146 | |
394a1476 AE |
147 | for sig in sigs: |
148 | key = get_pub_key(sig) | |
149 | keys += [key] | |
0bec96d6 | 150 | |
394a1476 | 151 | # recursive for nested layers of mime and/or gpg |
7b06b980 | 152 | plaintext, more_keys = email_decode_flatten(plaintext) |
8bb4b0d5 | 153 | |
394a1476 AE |
154 | body += plaintext |
155 | keys += more_keys | |
8bb4b0d5 | 156 | |
394a1476 | 157 | return body, keys |
8bb4b0d5 | 158 | |
8bb4b0d5 | 159 | |
394a1476 | 160 | def get_pub_key (sig): |
16da8026 | 161 | |
394a1476 | 162 | gpgme_ctx = gpgme.Context() |
9eb78301 | 163 | |
7b06b980 AE |
164 | fingerprint = sig.fpr |
165 | key = gpgme_ctx.get_key(fingerprint) | |
0bec96d6 | 166 | |
394a1476 | 167 | return key |
0bec96d6 AE |
168 | |
169 | ||
170 | def split_message (text): | |
171 | ||
7b06b980 | 172 | gpg_matches = re.search( \ |
394a1476 AE |
173 | '(-----BEGIN PGP MESSAGE-----' + \ |
174 | '.*' + \ | |
0bec96d6 AE |
175 | '-----END PGP MESSAGE-----)', \ |
176 | text, \ | |
f31ffe2f | 177 | flags=re.DOTALL) |
0bec96d6 | 178 | |
7b06b980 AE |
179 | if gpg_matches != None: |
180 | gpg_chunks = gpg_matches.groups() | |
0bec96d6 | 181 | else: |
7b06b980 AE |
182 | gpg_chunks = () |
183 | ||
184 | return gpg_chunks | |
0bec96d6 AE |
185 | |
186 | ||
394a1476 | 187 | def decrypt_chunks (gpg_chunks): |
0bec96d6 | 188 | |
6f6f3fb0 | 189 | return map(decrypt_chunk, gpg_chunks) |
0bec96d6 | 190 | |
0bec96d6 | 191 | |
394a1476 | 192 | def decrypt_chunk (gpg_chunk): |
0bec96d6 | 193 | |
394a1476 | 194 | gpgme_ctx = gpgme.Context() |
0bec96d6 | 195 | |
394a1476 | 196 | chunk_b = io.BytesIO(gpg_chunk.encode('ASCII')) |
0bec96d6 AE |
197 | plain_b = io.BytesIO() |
198 | ||
394a1476 | 199 | sigs = gpgme_ctx.decrypt_verify(chunk_b, plain_b) |
0bec96d6 | 200 | |
394a1476 AE |
201 | plaintext = plain_b.getvalue().decode('ASCII') |
202 | return (plaintext, sigs) | |
0bec96d6 AE |
203 | |
204 | ||
fafa21c3 AE |
205 | def choose_reply_encryption_key (keys): |
206 | ||
207 | reply_key = None | |
208 | for key in keys: | |
209 | if (key.can_encrypt == True): | |
210 | reply_key = key | |
211 | break | |
212 | ||
213 | return key | |
214 | ||
215 | ||
897cbaf6 AE |
216 | def generate_reply (plaintext, email_from, email_subject, encrypt_to_key, |
217 | sign_with_fingerprint): | |
1da9b527 | 218 | |
f87041f8 AE |
219 | plaintext_reply = "thanks for the message!\n\n\n" |
220 | plaintext_reply += email_quote_text(plaintext) | |
1da9b527 | 221 | |
897cbaf6 AE |
222 | encrypted_reply = encrypt_sign_message(plaintext_reply, encrypt_to_key, |
223 | sign_with_fingerprint) | |
1da9b527 AE |
224 | |
225 | reply = "To: " + email_from + "\n" | |
226 | reply += "Subject: " + email_subject + "\n" | |
f87041f8 | 227 | reply += "\n" |
1da9b527 AE |
228 | reply += encrypted_reply |
229 | ||
230 | return reply | |
231 | ||
232 | ||
f87041f8 AE |
233 | def email_quote_text (text): |
234 | ||
235 | quoted_message = re.sub(r'^', r'> ', text, flags=re.MULTILINE) | |
236 | ||
237 | return quoted_message | |
238 | ||
239 | ||
897cbaf6 | 240 | def encrypt_sign_message (plaintext, encrypt_to_key, sign_with_fingerprint): |
1da9b527 AE |
241 | |
242 | gpgme_ctx = gpgme.Context() | |
243 | gpgme_ctx.armor = True | |
244 | ||
897cbaf6 AE |
245 | sign_with_key = gpgme_ctx.get_key(sign_with_fingerprint) |
246 | gpgme_ctx.signers = [sign_with_key] | |
247 | ||
1da9b527 AE |
248 | plaintext_bytes = io.BytesIO(plaintext.encode('UTF-8')) |
249 | encrypted_bytes = io.BytesIO() | |
250 | ||
897cbaf6 | 251 | gpgme_ctx.encrypt_sign([encrypt_to_key], gpgme.ENCRYPT_ALWAYS_TRUST, |
1da9b527 AE |
252 | plaintext_bytes, encrypted_bytes) |
253 | ||
254 | encrypted_txt = encrypted_bytes.getvalue().decode('ASCII') | |
255 | return encrypted_txt | |
256 | ||
257 | ||
20f6e7c5 AE |
258 | def handle_args (): |
259 | if __name__ == "__main__": | |
260 | ||
261 | global progname | |
262 | progname = sys.argv[0] | |
263 | ||
264 | if len(sys.argv) > 1: | |
265 | print(progname + ": error, this program doesn't " \ | |
266 | "need any arguments.", file=sys.stderr) | |
267 | exit(1) | |
268 | ||
269 | ||
0bec96d6 AE |
270 | main() |
271 |